Comment by olliej

It's not required to be first, it's "suggested" :-/

But lets look at it another way:

* I buy an app on the App Store, and then find out that I have to use FB or Google login.

* So to use the app I have purchased I am required to allow the app and/or Google or Facebook to further their abuse of my privacy.

Alternatively:

* An App is shown as "Free"

* I install it, and it require FB or Google sign in.

That isn't free. Again, signing up for abuse of my privacy is not free.